Four Letter Words

Single player game

Rules

This is a simple game in which the objective is to change the word at
the top to the word at the bottom by changing one letter at a time. All
intermediate words must be legal.
To start playing, hit enter. This will make a copy of the top word
on the second row. Click on the letter you want to change and change
it by typing the new letter. Now hit enter. Repeat until all the rows
are filled.